selftests: add tests for the HID-bpf initial implementation
The tests are pretty basic: - create a virtual uhid device that no userspace will like (to not mess up the running system) - attach a BPF prog to it - open the matching hidraw node - inject one event and check: * that the BPF program can do something on the event stream * can modify the event stream - add another test where we attach/detach BPF programs to see if we get errors Note: the Makefile is extracted from selftests/bpf so we can rebuild the libbpf and bpftool components from the current kernel tree without relying on system installed components. Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Benjamin Tissoires
Jiri Kosina
parent
f5c27da4e3
commit
dbb60c8a26
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@ -9100,6 +9100,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid.git
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F: drivers/hid/
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F: include/linux/hid*
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F: include/uapi/linux/hid*
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F: tools/testing/selftests/hid/
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HID LOGITECH DRIVERS
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R: Filipe Laíns <lains@riseup.net>
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@ -26,6 +26,7 @@ TARGETS += fpu
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TARGETS += ftrace
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TARGETS += futex
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TARGETS += gpio
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TARGETS += hid
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TARGETS += intel_pstate
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TARGETS += ipc
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TARGETS += ir
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@ -0,0 +1,4 @@
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bpftool
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*.skel.h
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/tools
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hid_bpf
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@ -0,0 +1,233 @@
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# SPDX-License-Identifier: GPL-2.0
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# based on tools/testing/selftest/bpf/Makefile
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include ../../../build/Build.include
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include ../../../scripts/Makefile.arch
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include ../../../scripts/Makefile.include
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CXX ?= $(CROSS_COMPILE)g++
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CURDIR := $(abspath .)
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TOOLSDIR := $(abspath ../../..)
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TOP_SRCDIR = $(CURDIR)/../../../..
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KHDR_INCLUDES := $(TOP_SRCDIR)/usr/include
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LIBDIR := $(TOOLSDIR)/lib
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BPFDIR := $(LIBDIR)/bpf
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TOOLSINCDIR := $(TOOLSDIR)/include
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BPFTOOLDIR := $(TOOLSDIR)/bpf/bpftool
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HOSTPKG_CONFIG := pkg-config
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CFLAGS += -g -O0 -rdynamic -Wall -Werror -I$(KHDR_INCLUDES)
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LDLIBS += -lelf -lz -lrt -lpthread
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# Silence some warnings when compiled with clang
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ifneq ($(LLVM),)
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CFLAGS += -Wno-unused-command-line-argument
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endif
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# Order correspond to 'make run_tests' order
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TEST_GEN_PROGS = hid_bpf
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# Emit succinct information message describing current building step
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# $1 - generic step name (e.g., CC, LINK, etc);
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# $2 - optional "flavor" specifier; if provided, will be emitted as [flavor];
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# $3 - target (assumed to be file); only file name will be emitted;
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# $4 - optional extra arg, emitted as-is, if provided.
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ifeq ($(V),1)
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Q =
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msg =
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else
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Q = @
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msg = @printf ' %-8s%s %s%s\n' "$(1)" "$(if $(2), [$(2)])" "$(notdir $(3))" "$(if $(4), $(4))";
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MAKEFLAGS += --no-print-directory
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submake_extras := feature_display=0
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endif
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# override lib.mk's default rules
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OVERRIDE_TARGETS := 1
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override define CLEAN
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$(call msg,CLEAN)
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$(Q)$(RM) -r $(TEST_GEN_PROGS)
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$(Q)$(RM) -r $(EXTRA_CLEAN)
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endef
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include ../lib.mk
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SCRATCH_DIR := $(OUTPUT)/tools
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BUILD_DIR := $(SCRATCH_DIR)/build
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INCLUDE_DIR := $(SCRATCH_DIR)/include
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BPFOBJ := $(BUILD_DIR)/libbpf/libbpf.a
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ifneq ($(CROSS_COMPILE),)
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HOST_BUILD_DIR := $(BUILD_DIR)/host
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HOST_SCRATCH_DIR := $(OUTPUT)/host-tools
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HOST_INCLUDE_DIR := $(HOST_SCRATCH_DIR)/include
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else
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HOST_BUILD_DIR := $(BUILD_DIR)
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HOST_SCRATCH_DIR := $(SCRATCH_DIR)
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HOST_INCLUDE_DIR := $(INCLUDE_DIR)
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endif
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HOST_BPFOBJ := $(HOST_BUILD_DIR)/libbpf/libbpf.a
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RESOLVE_BTFIDS := $(HOST_BUILD_DIR)/resolve_btfids/resolve_btfids
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VMLINUX_BTF_PATHS ?= $(if $(O),$(O)/vmlinux) \
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$(if $(KBUILD_OUTPUT),$(KBUILD_OUTPUT)/vmlinux) \
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../../../../vmlinux \
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/sys/kernel/btf/vmlinux \
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/boot/vmlinux-$(shell uname -r)
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VMLINUX_BTF ?= $(abspath $(firstword $(wildcard $(VMLINUX_BTF_PATHS))))
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ifeq ($(VMLINUX_BTF),)
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$(error Cannot find a vmlinux for VMLINUX_BTF at any of "$(VMLINUX_BTF_PATHS)")
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endif
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# Define simple and short `make test_progs`, `make test_sysctl`, etc targets
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# to build individual tests.
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# NOTE: Semicolon at the end is critical to override lib.mk's default static
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# rule for binaries.
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$(notdir $(TEST_GEN_PROGS)): %: $(OUTPUT)/% ;
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# sort removes libbpf duplicates when not cross-building
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MAKE_DIRS := $(sort $(BUILD_DIR)/libbpf $(HOST_BUILD_DIR)/libbpf \
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$(HOST_BUILD_DIR)/bpftool $(HOST_BUILD_DIR)/resolve_btfids \
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$(INCLUDE_DIR))
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$(MAKE_DIRS):
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$(call msg,MKDIR,,$@)
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$(Q)mkdir -p $@
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$(OUTPUT)/%.o: %.c
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$(call msg,CC,,$@)
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$(Q)$(CC) $(CFLAGS) -c $(filter %.c,$^) $(LDLIBS) -o $@
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# LLVM's ld.lld doesn't support all the architectures, so use it only on x86
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ifeq ($(SRCARCH),x86)
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LLD := lld
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else
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LLD := ld
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endif
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DEFAULT_BPFTOOL := $(HOST_SCRATCH_DIR)/sbin/bpftool
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TEST_GEN_PROGS_EXTENDED += $(DEFAULT_BPFTOOL)
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$(TEST_GEN_PROGS) $(TEST_GEN_PROGS_EXTENDED): $(BPFOBJ)
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BPFTOOL ?= $(DEFAULT_BPFTOOL)
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$(DEFAULT_BPFTOOL): $(wildcard $(BPFTOOLDIR)/*.[ch] $(BPFTOOLDIR)/Makefile) \
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$(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/bpftool
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$(Q)$(MAKE) $(submake_extras) -C $(BPFTOOLDIR) \
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ARCH= CROSS_COMPILE= CC=$(HOSTCC) LD=$(HOSTLD) \
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EXTRA_CFLAGS='-g -O0' \
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OUTPUT=$(HOST_BUILD_DIR)/bpftool/ \
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LIBBPF_OUTPUT=$(HOST_BUILD_DIR)/libbpf/ \
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LIBBPF_DESTDIR=$(HOST_SCRATCH_DIR)/ \
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prefix= DESTDIR=$(HOST_SCRATCH_DIR)/ install-bin
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$(BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
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$(KHDR_INCLUDES)/linux/bpf.h \
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| $(BUILD_DIR)/libbpf
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$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) OUTPUT=$(BUILD_DIR)/libbpf/ \
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EXTRA_CFLAGS='-g -O0' \
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DESTDIR=$(SCRATCH_DIR) prefix= all install_headers
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ifneq ($(BPFOBJ),$(HOST_BPFOBJ))
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$(HOST_BPFOBJ): $(wildcard $(BPFDIR)/*.[ch] $(BPFDIR)/Makefile) \
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$(KHDR_INCLUDES)/linux/bpf.h \
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| $(HOST_BUILD_DIR)/libbpf
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$(Q)$(MAKE) $(submake_extras) -C $(BPFDIR) \
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EXTRA_CFLAGS='-g -O0' ARCH= CROSS_COMPILE= \
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OUTPUT=$(HOST_BUILD_DIR)/libbpf/ CC=$(HOSTCC) LD=$(HOSTLD) \
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DESTDIR=$(HOST_SCRATCH_DIR)/ prefix= all install_headers
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endif
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$(INCLUDE_DIR)/vmlinux.h: $(VMLINUX_BTF) $(BPFTOOL) | $(INCLUDE_DIR)
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ifeq ($(VMLINUX_H),)
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$(call msg,GEN,,$@)
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$(Q)$(BPFTOOL) btf dump file $(VMLINUX_BTF) format c > $@
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else
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$(call msg,CP,,$@)
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$(Q)cp "$(VMLINUX_H)" $@
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endif
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$(RESOLVE_BTFIDS): $(HOST_BPFOBJ) | $(HOST_BUILD_DIR)/resolve_btfids \
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$(TOOLSDIR)/bpf/resolve_btfids/main.c \
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$(TOOLSDIR)/lib/rbtree.c \
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$(TOOLSDIR)/lib/zalloc.c \
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$(TOOLSDIR)/lib/string.c \
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$(TOOLSDIR)/lib/ctype.c \
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$(TOOLSDIR)/lib/str_error_r.c
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$(Q)$(MAKE) $(submake_extras) -C $(TOOLSDIR)/bpf/resolve_btfids \
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CC=$(HOSTCC) LD=$(HOSTLD) AR=$(HOSTAR) \
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LIBBPF_INCLUDE=$(HOST_INCLUDE_DIR) \
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OUTPUT=$(HOST_BUILD_DIR)/resolve_btfids/ BPFOBJ=$(HOST_BPFOBJ)
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# Get Clang's default includes on this system, as opposed to those seen by
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# '-target bpf'. This fixes "missing" files on some architectures/distros,
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# such as asm/byteorder.h, asm/socket.h, asm/sockios.h, sys/cdefs.h etc.
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#
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# Use '-idirafter': Don't interfere with include mechanics except where the
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# build would have failed anyways.
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define get_sys_includes
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$(shell $(1) -v -E - </dev/null 2>&1 \
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| sed -n '/<...> search starts here:/,/End of search list./{ s| \(/.*\)|-idirafter \1|p }') \
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$(shell $(1) -dM -E - </dev/null | grep '__riscv_xlen ' | awk '{printf("-D__riscv_xlen=%d -D__BITS_PER_LONG=%d", $$3, $$3)}')
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endef
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# Determine target endianness.
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IS_LITTLE_ENDIAN = $(shell $(CC) -dM -E - </dev/null | \
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grep 'define __BYTE_ORDER__ __ORDER_LITTLE_ENDIAN__')
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MENDIAN=$(if $(IS_LITTLE_ENDIAN),-mlittle-endian,-mbig-endian)
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CLANG_SYS_INCLUDES = $(call get_sys_includes,$(CLANG))
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BPF_CFLAGS = -g -Werror -D__TARGET_ARCH_$(SRCARCH) $(MENDIAN) \
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-I$(INCLUDE_DIR) -I$(CURDIR) -I$(KHDR_INCLUDES) \
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-I$(abspath $(OUTPUT)/../usr/include)
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CLANG_CFLAGS = $(CLANG_SYS_INCLUDES) \
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-Wno-compare-distinct-pointer-types
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# Build BPF object using Clang
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# $1 - input .c file
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# $2 - output .o file
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# $3 - CFLAGS
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define CLANG_BPF_BUILD_RULE
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$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
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$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v3 -o $2
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endef
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# Similar to CLANG_BPF_BUILD_RULE, but with disabled alu32
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define CLANG_NOALU32_BPF_BUILD_RULE
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$(call msg,CLNG-BPF,$(TRUNNER_BINARY),$2)
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$(Q)$(CLANG) $3 -O2 -target bpf -c $1 -mcpu=v2 -o $2
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endef
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# Build BPF object using GCC
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define GCC_BPF_BUILD_RULE
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$(call msg,GCC-BPF,$(TRUNNER_BINARY),$2)
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$(Q)$(BPF_GCC) $3 -O2 -c $1 -o $2
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endef
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BPF_PROGS_DIR := progs
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BPF_BUILD_RULE := CLANG_BPF_BUILD_RULE
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BPF_SRCS := $(notdir $(wildcard $(BPF_PROGS_DIR)/*.c))
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BPF_OBJS := $(patsubst %.c,$(OUTPUT)/%.bpf.o, $(BPF_SRCS))
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BPF_SKELS := $(patsubst %.c,$(OUTPUT)/%.skel.h, $(BPF_SRCS))
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TEST_GEN_FILES += $(BPF_OBJS)
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$(BPF_PROGS_DIR)-bpfobjs := y
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$(BPF_OBJS): $(OUTPUT)/%.bpf.o: \
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$(BPF_PROGS_DIR)/%.c \
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$(wildcard $(BPF_PROGS_DIR)/*.h) \
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$(INCLUDE_DIR)/vmlinux.h \
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$(wildcard $(BPFDIR)/hid_bpf_*.h) \
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$(wildcard $(BPFDIR)/*.bpf.h) \
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| $(OUTPUT) $(BPFOBJ)
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$(call $(BPF_BUILD_RULE),$<,$@, $(BPF_CFLAGS))
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$(BPF_SKELS): %.skel.h: %.bpf.o $(BPFTOOL) | $(OUTPUT)
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$(call msg,GEN-SKEL,$(BINARY),$@)
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$(Q)$(BPFTOOL) gen object $(<:.o=.linked1.o) $<
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$(Q)$(BPFTOOL) gen skeleton $(<:.o=.linked1.o) name $(notdir $(<:.bpf.o=)) > $@
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$(OUTPUT)/%:%.c $(BPF_SKELS)
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$(call msg,BINARY,,$@)
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$(Q)$(LINK.c) $^ $(LDLIBS) -o $@
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EXTRA_CLEAN := $(SCRATCH_DIR) $(HOST_SCRATCH_DIR) feature bpftool \
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$(addprefix $(OUTPUT)/,*.o *.skel.h no_alu32)
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@ -0,0 +1,20 @@
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CONFIG_BPF_EVENTS=y
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CONFIG_BPFILTER=y
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CONFIG_BPF_JIT_ALWAYS_ON=y
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CONFIG_BPF_JIT=y
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CONFIG_BPF_KPROBE_OVERRIDE=y
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CONFIG_BPF_LSM=y
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CONFIG_BPF_PRELOAD_UMD=y
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CONFIG_BPF_PRELOAD=y
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CONFIG_BPF_STREAM_PARSER=y
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CONFIG_BPF_SYSCALL=y
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CONFIG_BPF=y
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CONFIG_CGROUP_BPF=y
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CONFIG_DEBUG_INFO_BTF=y
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CONFIG_FPROBE=y
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CONFIG_FTRACE_SYSCALLS=y
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CONFIG_FUNCTION_TRACER=y
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CONFIG_HIDRAW=y
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CONFIG_HID=y
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CONFIG_INPUT_EVDEV=y
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CONFIG_UHID=y
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@ -0,0 +1,675 @@
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2022 Red Hat */
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#include "hid.skel.h"
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#include "../kselftest_harness.h"
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#include <bpf/bpf.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <dirent.h>
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#include <poll.h>
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#include <pthread.h>
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#include <stdbool.h>
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#include <linux/hidraw.h>
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#include <linux/uhid.h>
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#define SHOW_UHID_DEBUG 0
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static unsigned char rdesc[] = {
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0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
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0x09, 0x21, /* Usage (Vendor Usage 0x21) */
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0xa1, 0x01, /* COLLECTION (Application) */
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0x09, 0x01, /* Usage (Vendor Usage 0x01) */
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0xa1, 0x00, /* COLLECTION (Physical) */
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0x85, 0x01, /* REPORT_ID (1) */
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0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
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0x19, 0x01, /* USAGE_MINIMUM (1) */
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0x29, 0x03, /* USAGE_MAXIMUM (3) */
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0x15, 0x00, /* LOGICAL_MINIMUM (0) */
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0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
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0x95, 0x03, /* REPORT_COUNT (3) */
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0x75, 0x01, /* REPORT_SIZE (1) */
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0x81, 0x02, /* INPUT (Data,Var,Abs) */
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0x95, 0x01, /* REPORT_COUNT (1) */
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0x75, 0x05, /* REPORT_SIZE (5) */
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0x81, 0x01, /* INPUT (Cnst,Var,Abs) */
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0x05, 0x01, /* USAGE_PAGE (Generic Desktop) */
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0x09, 0x30, /* USAGE (X) */
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0x09, 0x31, /* USAGE (Y) */
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0x15, 0x81, /* LOGICAL_MINIMUM (-127) */
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0x25, 0x7f, /* LOGICAL_MAXIMUM (127) */
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0x75, 0x10, /* REPORT_SIZE (16) */
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0x95, 0x02, /* REPORT_COUNT (2) */
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0x81, 0x06, /* INPUT (Data,Var,Rel) */
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0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
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0x19, 0x01, /* USAGE_MINIMUM (1) */
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0x29, 0x03, /* USAGE_MAXIMUM (3) */
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0x15, 0x00, /* LOGICAL_MINIMUM (0) */
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0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
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0x95, 0x03, /* REPORT_COUNT (3) */
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0x75, 0x01, /* REPORT_SIZE (1) */
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0x91, 0x02, /* Output (Data,Var,Abs) */
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0x95, 0x01, /* REPORT_COUNT (1) */
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0x75, 0x05, /* REPORT_SIZE (5) */
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0x91, 0x01, /* Output (Cnst,Var,Abs) */
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0x06, 0x00, 0xff, /* Usage Page (Vendor Defined Page 1) */
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0x19, 0x06, /* USAGE_MINIMUM (6) */
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0x29, 0x08, /* USAGE_MAXIMUM (8) */
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0x15, 0x00, /* LOGICAL_MINIMUM (0) */
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0x25, 0x01, /* LOGICAL_MAXIMUM (1) */
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0x95, 0x03, /* REPORT_COUNT (3) */
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0x75, 0x01, /* REPORT_SIZE (1) */
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0xb1, 0x02, /* Feature (Data,Var,Abs) */
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0x95, 0x01, /* REPORT_COUNT (1) */
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0x75, 0x05, /* REPORT_SIZE (5) */
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0x91, 0x01, /* Output (Cnst,Var,Abs) */
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0xc0, /* END_COLLECTION */
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0xc0, /* END_COLLECTION */
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};
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struct attach_prog_args {
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int prog_fd;
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unsigned int hid;
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int retval;
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};
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#define ASSERT_OK(data) ASSERT_FALSE(data)
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#define ASSERT_OK_PTR(ptr) ASSERT_NE(NULL, ptr)
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#define UHID_LOG(fmt, ...) do { \
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if (SHOW_UHID_DEBUG) \
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TH_LOG(fmt, ##__VA_ARGS__); \
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} while (0)
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static pthread_mutex_t uhid_started_mtx = PTHREAD_MUTEX_INITIALIZER;
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static pthread_cond_t uhid_started = PTHREAD_COND_INITIALIZER;
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/* no need to protect uhid_stopped, only one thread accesses it */
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static bool uhid_stopped;
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static int uhid_write(struct __test_metadata *_metadata, int fd, const struct uhid_event *ev)
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{
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ssize_t ret;
|
||||
|
||||
ret = write(fd, ev, sizeof(*ev));
|
||||
if (ret < 0) {
|
||||
TH_LOG("Cannot write to uhid: %m");
|
||||
return -errno;
|
||||
} else if (ret != sizeof(*ev)) {
|
||||
TH_LOG("Wrong size written to uhid: %zd != %zu",
|
||||
ret, sizeof(ev));
|
||||
return -EFAULT;
|
||||
} else {
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
|
||||
static int uhid_create(struct __test_metadata *_metadata, int fd, int rand_nb)
|
||||
{
|
||||
struct uhid_event ev;
|
||||
char buf[25];
|
||||
|
||||
sprintf(buf, "test-uhid-device-%d", rand_nb);
|
||||
|
||||
memset(&ev, 0, sizeof(ev));
|
||||
ev.type = UHID_CREATE;
|
||||
strcpy((char *)ev.u.create.name, buf);
|
||||
ev.u.create.rd_data = rdesc;
|
||||
ev.u.create.rd_size = sizeof(rdesc);
|
||||
ev.u.create.bus = BUS_USB;
|
||||
ev.u.create.vendor = 0x0001;
|
||||
ev.u.create.product = 0x0a37;
|
||||
ev.u.create.version = 0;
|
||||
ev.u.create.country = 0;
|
||||
|
||||
sprintf(buf, "%d", rand_nb);
|
||||
strcpy((char *)ev.u.create.phys, buf);
|
||||
|
||||
return uhid_write(_metadata, fd, &ev);
|
||||
}
|
||||
|
||||
static void uhid_destroy(struct __test_metadata *_metadata, int fd)
|
||||
{
|
||||
struct uhid_event ev;
|
||||
|
||||
memset(&ev, 0, sizeof(ev));
|
||||
ev.type = UHID_DESTROY;
|
||||
|
||||
uhid_write(_metadata, fd, &ev);
|
||||
}
|
||||
|
||||
static int uhid_event(struct __test_metadata *_metadata, int fd)
|
||||
{
|
||||
struct uhid_event ev;
|
||||
ssize_t ret;
|
||||
|
||||
memset(&ev, 0, sizeof(ev));
|
||||
ret = read(fd, &ev, sizeof(ev));
|
||||
if (ret == 0) {
|
||||
UHID_LOG("Read HUP on uhid-cdev");
|
||||
return -EFAULT;
|
||||
} else if (ret < 0) {
|
||||
UHID_LOG("Cannot read uhid-cdev: %m");
|
||||
return -errno;
|
||||
} else if (ret != sizeof(ev)) {
|
||||
UHID_LOG("Invalid size read from uhid-dev: %zd != %zu",
|
||||
ret, sizeof(ev));
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
switch (ev.type) {
|
||||
case UHID_START:
|
||||
pthread_mutex_lock(&uhid_started_mtx);
|
||||
pthread_cond_signal(&uhid_started);
|
||||
pthread_mutex_unlock(&uhid_started_mtx);
|
||||
|
||||
UHID_LOG("UHID_START from uhid-dev");
|
||||
break;
|
||||
case UHID_STOP:
|
||||
uhid_stopped = true;
|
||||
|
||||
UHID_LOG("UHID_STOP from uhid-dev");
|
||||
break;
|
||||
case UHID_OPEN:
|
||||
UHID_LOG("UHID_OPEN from uhid-dev");
|
||||
break;
|
||||
case UHID_CLOSE:
|
||||
UHID_LOG("UHID_CLOSE from uhid-dev");
|
||||
break;
|
||||
case UHID_OUTPUT:
|
||||
UHID_LOG("UHID_OUTPUT from uhid-dev");
|
||||
break;
|
||||
case UHID_GET_REPORT:
|
||||
UHID_LOG("UHID_GET_REPORT from uhid-dev");
|
||||
break;
|
||||
case UHID_SET_REPORT:
|
||||
UHID_LOG("UHID_SET_REPORT from uhid-dev");
|
||||
break;
|
||||
default:
|
||||
TH_LOG("Invalid event from uhid-dev: %u", ev.type);
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct uhid_thread_args {
|
||||
int fd;
|
||||
struct __test_metadata *_metadata;
|
||||
};
|
||||
static void *uhid_read_events_thread(void *arg)
|
||||
{
|
||||
struct uhid_thread_args *args = (struct uhid_thread_args *)arg;
|
||||
struct __test_metadata *_metadata = args->_metadata;
|
||||
struct pollfd pfds[1];
|
||||
int fd = args->fd;
|
||||
int ret = 0;
|
||||
|
||||
pfds[0].fd = fd;
|
||||
pfds[0].events = POLLIN;
|
||||
|
||||
uhid_stopped = false;
|
||||
|
||||
while (!uhid_stopped) {
|
||||
ret = poll(pfds, 1, 100);
|
||||
if (ret < 0) {
|
||||
TH_LOG("Cannot poll for fds: %m");
|
||||
break;
|
||||
}
|
||||
if (pfds[0].revents & POLLIN) {
|
||||
ret = uhid_event(_metadata, fd);
|
||||
if (ret)
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
return (void *)(long)ret;
|
||||
}
|
||||
|
||||
static int uhid_start_listener(struct __test_metadata *_metadata, pthread_t *tid, int uhid_fd)
|
||||
{
|
||||
struct uhid_thread_args args = {
|
||||
.fd = uhid_fd,
|
||||
._metadata = _metadata,
|
||||
};
|
||||
int err;
|
||||
|
||||
pthread_mutex_lock(&uhid_started_mtx);
|
||||
err = pthread_create(tid, NULL, uhid_read_events_thread, (void *)&args);
|
||||
ASSERT_EQ(0, err) {
|
||||
TH_LOG("Could not start the uhid thread: %d", err);
|
||||
pthread_mutex_unlock(&uhid_started_mtx);
|
||||
close(uhid_fd);
|
||||
return -EIO;
|
||||
}
|
||||
pthread_cond_wait(&uhid_started, &uhid_started_mtx);
|
||||
pthread_mutex_unlock(&uhid_started_mtx);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int uhid_send_event(struct __test_metadata *_metadata, int fd, __u8 *buf, size_t size)
|
||||
{
|
||||
struct uhid_event ev;
|
||||
|
||||
if (size > sizeof(ev.u.input.data))
|
||||
return -E2BIG;
|
||||
|
||||
memset(&ev, 0, sizeof(ev));
|
||||
ev.type = UHID_INPUT2;
|
||||
ev.u.input2.size = size;
|
||||
|
||||
memcpy(ev.u.input2.data, buf, size);
|
||||
|
||||
return uhid_write(_metadata, fd, &ev);
|
||||
}
|
||||
|
||||
static int setup_uhid(struct __test_metadata *_metadata, int rand_nb)
|
||||
{
|
||||
int fd;
|
||||
const char *path = "/dev/uhid";
|
||||
int ret;
|
||||
|
||||
fd = open(path, O_RDWR | O_CLOEXEC);
|
||||
ASSERT_GE(fd, 0) TH_LOG("open uhid-cdev failed; %d", fd);
|
||||
|
||||
ret = uhid_create(_metadata, fd, rand_nb);
|
||||
ASSERT_EQ(0, ret) {
|
||||
TH_LOG("create uhid device failed: %d", ret);
|
||||
close(fd);
|
||||
}
|
||||
|
||||
return fd;
|
||||
}
|
||||
|
||||
static bool match_sysfs_device(int dev_id, const char *workdir, struct dirent *dir)
|
||||
{
|
||||
const char *target = "0003:0001:0A37.*";
|
||||
char phys[512];
|
||||
char uevent[1024];
|
||||
char temp[512];
|
||||
int fd, nread;
|
||||
bool found = false;
|
||||
|
||||
if (fnmatch(target, dir->d_name, 0))
|
||||
return false;
|
||||
|
||||
/* we found the correct VID/PID, now check for phys */
|
||||
sprintf(uevent, "%s/%s/uevent", workdir, dir->d_name);
|
||||
|
||||
fd = open(uevent, O_RDONLY | O_NONBLOCK);
|
||||
if (fd < 0)
|
||||
return false;
|
||||
|
||||
sprintf(phys, "PHYS=%d", dev_id);
|
||||
|
||||
nread = read(fd, temp, ARRAY_SIZE(temp));
|
||||
if (nread > 0 && (strstr(temp, phys)) != NULL)
|
||||
found = true;
|
||||
|
||||
close(fd);
|
||||
|
||||
return found;
|
||||
}
|
||||
|
||||
static int get_hid_id(int dev_id)
|
||||
{
|
||||
const char *workdir = "/sys/devices/virtual/misc/uhid";
|
||||
const char *str_id;
|
||||
DIR *d;
|
||||
struct dirent *dir;
|
||||
int found = -1, attempts = 3;
|
||||
|
||||
/* it would be nice to be able to use nftw, but the no_alu32 target doesn't support it */
|
||||
|
||||
while (found < 0 && attempts > 0) {
|
||||
attempts--;
|
||||
d = opendir(workdir);
|
||||
if (d) {
|
||||
while ((dir = readdir(d)) != NULL) {
|
||||
if (!match_sysfs_device(dev_id, workdir, dir))
|
||||
continue;
|
||||
|
||||
str_id = dir->d_name + sizeof("0003:0001:0A37.");
|
||||
found = (int)strtol(str_id, NULL, 16);
|
||||
|
||||
break;
|
||||
}
|
||||
closedir(d);
|
||||
}
|
||||
if (found < 0)
|
||||
usleep(100000);
|
||||
}
|
||||
|
||||
return found;
|
||||
}
|
||||
|
||||
static int get_hidraw(int dev_id)
|
||||
{
|
||||
const char *workdir = "/sys/devices/virtual/misc/uhid";
|
||||
char sysfs[1024];
|
||||
DIR *d, *subd;
|
||||
struct dirent *dir, *subdir;
|
||||
int i, found = -1;
|
||||
|
||||
/* retry 5 times in case the system is loaded */
|
||||
for (i = 5; i > 0; i--) {
|
||||
usleep(10);
|
||||
d = opendir(workdir);
|
||||
|
||||
if (!d)
|
||||
continue;
|
||||
|
||||
while ((dir = readdir(d)) != NULL) {
|
||||
if (!match_sysfs_device(dev_id, workdir, dir))
|
||||
continue;
|
||||
|
||||
sprintf(sysfs, "%s/%s/hidraw", workdir, dir->d_name);
|
||||
|
||||
subd = opendir(sysfs);
|
||||
if (!subd)
|
||||
continue;
|
||||
|
||||
while ((subdir = readdir(subd)) != NULL) {
|
||||
if (fnmatch("hidraw*", subdir->d_name, 0))
|
||||
continue;
|
||||
|
||||
found = atoi(subdir->d_name + strlen("hidraw"));
|
||||
}
|
||||
|
||||
closedir(subd);
|
||||
|
||||
if (found > 0)
|
||||
break;
|
||||
}
|
||||
closedir(d);
|
||||
}
|
||||
|
||||
return found;
|
||||
}
|
||||
|
||||
static int open_hidraw(int dev_id)
|
||||
{
|
||||
int hidraw_number;
|
||||
char hidraw_path[64] = { 0 };
|
||||
|
||||
hidraw_number = get_hidraw(dev_id);
|
||||
if (hidraw_number < 0)
|
||||
return hidraw_number;
|
||||
|
||||
/* open hidraw node to check the other side of the pipe */
|
||||
sprintf(hidraw_path, "/dev/hidraw%d", hidraw_number);
|
||||
return open(hidraw_path, O_RDWR | O_NONBLOCK);
|
||||
}
|
||||
|
||||
FIXTURE(hid_bpf) {
|
||||
int dev_id;
|
||||
int uhid_fd;
|
||||
int hidraw_fd;
|
||||
int hid_id;
|
||||
pthread_t tid;
|
||||
struct hid *skel;
|
||||
};
|
||||
static void detach_bpf(FIXTURE_DATA(hid_bpf) * self)
|
||||
{
|
||||
if (self->hidraw_fd)
|
||||
close(self->hidraw_fd);
|
||||
self->hidraw_fd = 0;
|
||||
|
||||
hid__destroy(self->skel);
|
||||
self->skel = NULL;
|
||||
}
|
||||
|
||||
FIXTURE_TEARDOWN(hid_bpf) {
|
||||
void *uhid_err;
|
||||
|
||||
uhid_destroy(_metadata, self->uhid_fd);
|
||||
|
||||
detach_bpf(self);
|
||||
pthread_join(self->tid, &uhid_err);
|
||||
}
|
||||
#define TEARDOWN_LOG(fmt, ...) do { \
|
||||
TH_LOG(fmt, ##__VA_ARGS__); \
|
||||
hid_bpf_teardown(_metadata, self, variant); \
|
||||
} while (0)
|
||||
|
||||
FIXTURE_SETUP(hid_bpf)
|
||||
{
|
||||
time_t t;
|
||||
int err;
|
||||
|
||||
/* initialize random number generator */
|
||||
srand((unsigned int)time(&t));
|
||||
|
||||
self->dev_id = rand() % 1024;
|
||||
|
||||
self->uhid_fd = setup_uhid(_metadata, self->dev_id);
|
||||
|
||||
/* locate the uev, self, variant);ent file of the created device */
|
||||
self->hid_id = get_hid_id(self->dev_id);
|
||||
ASSERT_GT(self->hid_id, 0)
|
||||
TEARDOWN_LOG("Could not locate uhid device id: %d", self->hid_id);
|
||||
|
||||
err = uhid_start_listener(_metadata, &self->tid, self->uhid_fd);
|
||||
ASSERT_EQ(0, err) TEARDOWN_LOG("could not start udev listener: %d", err);
|
||||
}
|
||||
|
||||
struct test_program {
|
||||
const char *name;
|
||||
};
|
||||
#define LOAD_PROGRAMS(progs) \
|
||||
load_programs(progs, ARRAY_SIZE(progs), _metadata, self, variant)
|
||||
#define LOAD_BPF \
|
||||
load_programs(NULL, 0, _metadata, self, variant)
|
||||
static void load_programs(const struct test_program programs[],
|
||||
const size_t progs_count,
|
||||
struct __test_metadata *_metadata,
|
||||
FIXTURE_DATA(hid_bpf) * self,
|
||||
const FIXTURE_VARIANT(hid_bpf) * variant)
|
||||
{
|
||||
int attach_fd, err = -EINVAL;
|
||||
struct attach_prog_args args = {
|
||||
.retval = -1,
|
||||
};
|
||||
DECLARE_LIBBPF_OPTS(bpf_test_run_opts, tattr,
|
||||
.ctx_in = &args,
|
||||
.ctx_size_in = sizeof(args),
|
||||
);
|
||||
|
||||
/* open the bpf file */
|
||||
self->skel = hid__open();
|
||||
ASSERT_OK_PTR(self->skel) TEARDOWN_LOG("Error while calling hid__open");
|
||||
|
||||
for (int i = 0; i < progs_count; i++) {
|
||||
struct bpf_program *prog;
|
||||
|
||||
prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
|
||||
programs[i].name);
|
||||
ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
|
||||
|
||||
bpf_program__set_autoload(prog, true);
|
||||
}
|
||||
|
||||
err = hid__load(self->skel);
|
||||
ASSERT_OK(err) TH_LOG("hid_skel_load failed: %d", err);
|
||||
|
||||
attach_fd = bpf_program__fd(self->skel->progs.attach_prog);
|
||||
ASSERT_GE(attach_fd, 0) TH_LOG("locate attach_prog: %d", attach_fd);
|
||||
|
||||
for (int i = 0; i < progs_count; i++) {
|
||||
struct bpf_program *prog;
|
||||
|
||||
prog = bpf_object__find_program_by_name(*self->skel->skeleton->obj,
|
||||
programs[i].name);
|
||||
ASSERT_OK_PTR(prog) TH_LOG("can not find program by name '%s'", programs[i].name);
|
||||
|
||||
args.prog_fd = bpf_program__fd(prog);
|
||||
args.hid = self->hid_id;
|
||||
err = bpf_prog_test_run_opts(attach_fd, &tattr);
|
||||
ASSERT_OK(args.retval) TH_LOG("attach_hid(%s): %d", programs[i].name, args.retval);
|
||||
}
|
||||
|
||||
self->hidraw_fd = open_hidraw(self->dev_id);
|
||||
ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
|
||||
}
|
||||
|
||||
/*
|
||||
* A simple test to see if the fixture is working fine.
|
||||
* If this fails, none of the other tests will pass.
|
||||
*/
|
||||
TEST_F(hid_bpf, test_create_uhid)
|
||||
{
|
||||
}
|
||||
|
||||
/*
|
||||
* Attach hid_first_event to the given uhid device,
|
||||
* retrieve and open the matching hidraw node,
|
||||
* inject one event in the uhid device,
|
||||
* check that the program sees it and can change the data
|
||||
*/
|
||||
TEST_F(hid_bpf, raw_event)
|
||||
{
|
||||
const struct test_program progs[] = {
|
||||
{ .name = "hid_first_event" },
|
||||
};
|
||||
__u8 buf[10] = {0};
|
||||
int err;
|
||||
|
||||
LOAD_PROGRAMS(progs);
|
||||
|
||||
/* check that the program is correctly loaded */
|
||||
ASSERT_EQ(self->skel->data->callback_check, 52) TH_LOG("callback_check1");
|
||||
ASSERT_EQ(self->skel->data->callback2_check, 52) TH_LOG("callback2_check1");
|
||||
|
||||
/* inject one event */
|
||||
buf[0] = 1;
|
||||
buf[1] = 42;
|
||||
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
|
||||
|
||||
/* check that hid_first_event() was executed */
|
||||
ASSERT_EQ(self->skel->data->callback_check, 42) TH_LOG("callback_check1");
|
||||
|
||||
/* read the data from hidraw */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
err = read(self->hidraw_fd, buf, sizeof(buf));
|
||||
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
|
||||
ASSERT_EQ(buf[0], 1);
|
||||
ASSERT_EQ(buf[2], 47);
|
||||
|
||||
/* inject another event */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
buf[0] = 1;
|
||||
buf[1] = 47;
|
||||
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
|
||||
|
||||
/* check that hid_first_event() was executed */
|
||||
ASSERT_EQ(self->skel->data->callback_check, 47) TH_LOG("callback_check1");
|
||||
|
||||
/* read the data from hidraw */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
err = read(self->hidraw_fd, buf, sizeof(buf));
|
||||
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
|
||||
ASSERT_EQ(buf[2], 52);
|
||||
}
|
||||
|
||||
/*
|
||||
* Ensures that we can attach/detach programs
|
||||
*/
|
||||
TEST_F(hid_bpf, test_attach_detach)
|
||||
{
|
||||
const struct test_program progs[] = {
|
||||
{ .name = "hid_first_event" },
|
||||
};
|
||||
__u8 buf[10] = {0};
|
||||
int err;
|
||||
|
||||
LOAD_PROGRAMS(progs);
|
||||
|
||||
/* inject one event */
|
||||
buf[0] = 1;
|
||||
buf[1] = 42;
|
||||
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
|
||||
|
||||
/* read the data from hidraw */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
err = read(self->hidraw_fd, buf, sizeof(buf));
|
||||
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
|
||||
ASSERT_EQ(buf[0], 1);
|
||||
ASSERT_EQ(buf[2], 47);
|
||||
|
||||
/* pin the program and immediately unpin it */
|
||||
#define PIN_PATH "/sys/fs/bpf/hid_first_event"
|
||||
bpf_program__pin(self->skel->progs.hid_first_event, PIN_PATH);
|
||||
remove(PIN_PATH);
|
||||
#undef PIN_PATH
|
||||
usleep(100000);
|
||||
|
||||
/* detach the program */
|
||||
detach_bpf(self);
|
||||
|
||||
self->hidraw_fd = open_hidraw(self->dev_id);
|
||||
ASSERT_GE(self->hidraw_fd, 0) TH_LOG("open_hidraw");
|
||||
|
||||
/* inject another event */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
buf[0] = 1;
|
||||
buf[1] = 47;
|
||||
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
|
||||
|
||||
/* read the data from hidraw */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
err = read(self->hidraw_fd, buf, sizeof(buf));
|
||||
ASSERT_EQ(err, 6) TH_LOG("read_hidraw_no_bpf");
|
||||
ASSERT_EQ(buf[0], 1);
|
||||
ASSERT_EQ(buf[1], 47);
|
||||
ASSERT_EQ(buf[2], 0);
|
||||
|
||||
/* re-attach our program */
|
||||
|
||||
LOAD_PROGRAMS(progs);
|
||||
|
||||
/* inject one event */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
buf[0] = 1;
|
||||
buf[1] = 42;
|
||||
uhid_send_event(_metadata, self->uhid_fd, buf, 6);
|
||||
|
||||
/* read the data from hidraw */
|
||||
memset(buf, 0, sizeof(buf));
|
||||
err = read(self->hidraw_fd, buf, sizeof(buf));
|
||||
ASSERT_EQ(err, 6) TH_LOG("read_hidraw");
|
||||
ASSERT_EQ(buf[0], 1);
|
||||
ASSERT_EQ(buf[2], 47);
|
||||
}
|
||||
|
||||
static int libbpf_print_fn(enum libbpf_print_level level,
|
||||
const char *format, va_list args)
|
||||
{
|
||||
char buf[1024];
|
||||
|
||||
if (level == LIBBPF_DEBUG)
|
||||
return 0;
|
||||
|
||||
snprintf(buf, sizeof(buf), "# %s", format);
|
||||
|
||||
vfprintf(stdout, buf, args);
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void __attribute__((constructor)) __constructor_order_last(void)
|
||||
{
|
||||
if (!__constructor_order)
|
||||
__constructor_order = _CONSTRUCTOR_ORDER_BACKWARD;
|
||||
}
|
||||
|
||||
int main(int argc, char **argv)
|
||||
{
|
||||
/* Use libbpf 1.0 API mode */
|
||||
libbpf_set_strict_mode(LIBBPF_STRICT_ALL);
|
||||
libbpf_set_print(libbpf_print_fn);
|
||||
|
||||
return test_harness_run(argc, argv);
|
||||
}
|
||||
|
|
@ -0,0 +1,41 @@
|
|||
// SPDX-License-Identifier: GPL-2.0
|
||||
/* Copyright (c) 2022 Red hat */
|
||||
#include "vmlinux.h"
|
||||
#include <bpf/bpf_helpers.h>
|
||||
#include <bpf/bpf_tracing.h>
|
||||
#include "hid_bpf_helpers.h"
|
||||
|
||||
char _license[] SEC("license") = "GPL";
|
||||
|
||||
struct attach_prog_args {
|
||||
int prog_fd;
|
||||
unsigned int hid;
|
||||
int retval;
|
||||
};
|
||||
|
||||
__u64 callback_check = 52;
|
||||
__u64 callback2_check = 52;
|
||||
|
||||
SEC("?fmod_ret/hid_bpf_device_event")
|
||||
int BPF_PROG(hid_first_event, struct hid_bpf_ctx *hid_ctx)
|
||||
{
|
||||
__u8 *rw_data = hid_bpf_get_data(hid_ctx, 0 /* offset */, 3 /* size */);
|
||||
|
||||
if (!rw_data)
|
||||
return 0; /* EPERM check */
|
||||
|
||||
callback_check = rw_data[1];
|
||||
|
||||
rw_data[2] = rw_data[1] + 5;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
SEC("syscall")
|
||||
int attach_prog(struct attach_prog_args *ctx)
|
||||
{
|
||||
ctx->retval = hid_bpf_attach_prog(ctx->hid,
|
||||
ctx->prog_fd,
|
||||
0);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,14 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0-only */
|
||||
/* Copyright (c) 2022 Benjamin Tissoires
|
||||
*/
|
||||
|
||||
#ifndef __HID_BPF_HELPERS_H
|
||||
#define __HID_BPF_HELPERS_H
|
||||
|
||||
/* following are kfuncs exported by HID for HID-BPF */
|
||||
extern __u8 *hid_bpf_get_data(struct hid_bpf_ctx *ctx,
|
||||
unsigned int offset,
|
||||
const size_t __sz) __ksym;
|
||||
extern int hid_bpf_attach_prog(unsigned int hid_id, int prog_fd, u32 flags) __ksym;
|
||||
|
||||
#endif /* __HID_BPF_HELPERS_H */
|
||||
Loading…
Reference in New Issue